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    <p>Try to avoid C-style casts. If you write (int)ptr where ptr is some pointer this will be a reinterpret_cast which is probably not what you want. For converting numbers to strings and back again check various FAQs. One way to do this is to use the <a href="http://www.cplusplus.com/reference/iostream/stringstream/" rel="nofollow noreferrer">std::stringstream</a> class.</p> <p>A C-style cast is dangerous because it can be used for lots of things and it's not always apparent what it does. C++ offers alternatives (static_cast, dynamic_cast, const_cast, reinterpret_cast) and a functional-style cast which is equivalent to a static cast).</p> <p>In the case of (int)ptr it converts the <em>pointer</em> to an int and <em>not</em> the string representation of a number the pointer points to.</p> <p>You might also want to check out <a href="http://www.boost.org/doc/libs/1_40_0/libs/conversion/lexical_cast.htm" rel="nofollow noreferrer">Boost's lexical_cast</a>.</p> <p>Edit: Don't use typeid for this. You can handle this completely at compile-time:</p> <pre><code>template&lt;typename T&gt; struct doit; // no definition template&lt;&gt; struct doit&lt;int&gt; { static void foo() { // action 1 for ints } }; template&lt;&gt; struct doit&lt;float&gt; { static void foo() { // action 2 for floats } }; .... template&lt;typename T&gt; void blah(T x) { // common stuff doit&lt;T&gt;::foo(); // specific stuff // common stuff } </code></pre> <p>In case T is neither int nor float you get a compile-time error. I hope you get the idea.</p>
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    1. COI've amended the code above, the issue is actually with else clause erroring at compile time, it should fall into the first branch of the if statement.
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    2. COCould you provide an example of this being used inside I class, the above seems to be what I'm after but I can't seem to get it to work. Also would you happen to have any reference to using templates in this way my c++ reference doesn't mention this method.
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